Aster family calyxes
I misspoke yesterday. Asters don't have sepals, they have calyxes. For plants with tubular flowers the sepals are also tubular, forming the calyx that protects buds, then surrounds the base of the expanded corolla. In the aster family, many species get wildly creative after that. These feathery dandelion umbrellas are calyxes, adapted for seed transportation. The clayxes attach to the ovary, so they're ideally located for this job.